Requires the federal government to fully fund the costs of dam safety modifications of certain dikes owned by the Bureau of Reclamation.

(1) in the section heading, by inserting dams and before dikes;

(2) in subsection (a), by striking effective beginning on the date of enactment of this section, the Federal share of the operations and maintenance costs of a dike described in subsection (b) and inserting the Federal share of the dam safety modifications costs of a dike described in subsection (c);

(3) by redesignating subsection (b) as subsection (c);

(4) by inserting after subsection (a) the following:

Notwithstanding any other provision of law (including regulations), effective during the 10-year period beginning on the date of enactment of this Act, the Federal share of the costs to repair or replace a gate and any ancillary gate components of a dam described in subsection (c) shall be 100 percent.; and

(5) in subsection (c) (as so redesignated)—

(A) in the subsection heading, by inserting dams and before dikes;

(B) in the matter preceding paragraph (1), by striking A dike referred to in subsection (a) is a and inserting A dam or dike referred to in subsections (a) and (b) is a dam or; and

(C) in paragraph (2), by striking December 31, 1945 and inserting December 31, 1948.